2/3/2017
Redox and Synthesis
Redox and Synthesis:
At the conclusion of our time together,
you should be able to:
1. Recognize a synthesis chemical reaction
2. Show the change in oxidation numbers in
this reaction type
1
2/3/2017
Simple Reactions
Synthesis
Decomposition
(Combination)
Single
Replacement
Synthesis
A +
Decomposition
Double
Replacement
B
AB
AB
A + B
Single
AB + C
Replacement
A +CB
Double A B + C D
Replacement
AD + C B
2
2/3/2017
Synthesis
A +
Decomposition
B
AB
AB
A + B
Single
AB + C
Replacement
A +CB
Double A B + C D
Replacement
AD + C B
1. Synthesis reactions
•
•
Synthesis reactions occur when two substances
(generally elements) combine and form a
compound. (Sometimes these are called
combination or addition reactions.)
reactant + reactant  1 product
Basically:
A + B  AB
• Example:
2H2 + O2  2H2O
• Example:
C + O2  CO2
3
2/3/2017
Synthesis Reactions
•
Here is another example of a synthesis reaction
Synthesis and Redox
Predict the products, balance the following
reaction and give the change in oxidation
numbers:
Na + Cl2  NaCl
2 Na + Br2  2 NaCl
Each Na loses 1eoxidation, reducing agent
Each Cl gains 1ereduction, oxidizing agent
•
4
2/3/2017
Redox and Synthesis:
Let’s see if you can:
1. Recognize a synthesis chemical reaction
2. Show the change in oxidation numbers in
this reaction type
Practice
•
•
•
•
Predict the products. Write and balance the
following synthesis reaction equations.
Sodium metal reacts with chlorine gas
Na(s) + Cl2(g)  NaCl
Solid Magnesium reacts with fluorine gas
Mg(s) + F2(g)  MgF2
Aluminum metal reacts with fluorine gas
Al(s) + F2(g)  AlF3
5
2/3/2017
Practice
State the type, predict the products, balance
the following reactions and show the change in
oxidation numbers:
Cs + Br2  CsBr
2 Cs + Br2  2 CsBr
Each Cs loses 1eoxidation, reducing agent
Each Br gains 1ereduction, oxidizing agent
•
6